Coal-digger



J. NEWARK.

COAL DIGGER.

:APELICATION FILED JUNE 26. 1918. 1,368, 189. Patented Feb. 8, 1921. a v 3 SHEETS-SHEET I.

J. NEWARK.

i COAL DIGGER. APPLICATION HLEn :uns 28. 1918.

1368,189. I Patented Feb. 8, 192 1.v

3 SHEETS-SHEET 3.

JOHN NEWARK, OF CORAL, PEN'NSYLVANIA.

CDAL-DIGGER.

specification of Letters Patent.

' Patented Feb. 8, 1921.

Application filed. June 2G, 1918. Serial No. 242,035.

To all w ham it maq/ ooaccm Be it known that l, JOHN Nnwank, a citizen of the United States, residing at Coral, in the county of Indiana and State of Pennsylvania, have invented new and useful lmprovements in Coal-Diggers, of which the following is a specification.

This invention relates to new and useful improvements in coal diggers and the principal object of the invention is to provide means for under-cutting the shaft head.

Another object of the invention is to provide means for boring a hole in the-'shaft head and then automatically moving the bit transversely across the head to form the under-cut.

Other objects of the invention relate to the means for adjustably supporting the boring means on a truck so that the Cutting tool may be placed in the desired position in the shaft head, tomeans for feeding the tool forwardly to bore a hole in the head, to means for automatically stopping this forward movement when the hole is completed, to means for moving the cutting tool side- Wise after the completion of the forward movement, to means for returning` the parts to starting position, and to means for giving the parts a slow forward movement and a quick return movenient.

The invention also consists in certain other features of construction and in the combination and arrangement of the several parts, 4to be hereinafter fully described, illustrated in the accoinpanying drawings and specifically pointed out in the appended claims.

n describing my invention in detail, reference will be had to the accompanying (lrawingijs wherein like characters denote like or corresponding parts throughout the several views, and in which I Figurc 1 is a side elevation of the invention.

Fig. 2 is a plan view.

Fig. 3 is an end view.

ffig. 4 is a plan view, with parts broken away, of the means for moving the device cross-Wise.

Fig. 5 is a longitudinal section.

Fig. 6 is a section on line 6-6 of Fig. 4.

Figs. 7, 8, 9 and 10 are detailed views.

n these views 1 indicates a truck upon which the device is mounted. rThe device is adjustably mounted on said truck by means of an arm 2 having one end rotatably secured to the truck and its other end rotatably supportlng a block or guideV member 3. i indicates the lower' track member, of substantially channel form and provided with the guide ways 5 into which the block or guide member 3 fits. The outer sides of this track memberl are provided with the guide pieces 6. One side of this; track member is provided with the rack 7 and on the opposite side the guide piece 6 has the rack 8 on its upper edge. w

9 indicates the lower carriage engaging with the lower track member and having its sides embracing the sides of said member. These sides of the carriage are provided with suitable grooves for receiving the guide pieces 6 so as to hold the carriage on the track. The upper side of the carriage is provided with an enlarged circular stud 10 which engages a circular opening 11 formed in the bottom of an upper track member 12. The stud forms a bearing for a toothed wheel 13 which is engaged by a toothed wheel 14 located on a shaft 15 carried by the arms 1G proiecting from one side of the lower carriage 9. The wheel li is loosely mounted 011 said shaft and said wheel is pro- Vided with interior teeth 17 which are adapted to be engaged by dogs 18 carried by a disk 19 keyed to the shaft 15. These dogs are so arranged that they will lock the wheel 14 to the disk when said wheel is rotated in one direction and will slip over the teeth when the wheel is rotated in the other direction so that the disk will not be moved. 20 indicates a toothed wheel keyed to the shaft 15 and meshing with the rack 7 on the lower track member 4:.

The other side of the carriage 9 carries a pair of toothed Wheels, which are indicated by the numerals 21 and 22. The wheel 21 carries the dogs 23 which are adapted to engage the teeth 24 on the wheel 22 when said wheel 21 is rotated in one direction, and to slide over said teeth when the wheel is rotated in the other dircction. The wheel 22 meshes with the rack 8 on the track member 4 while the wheel 21 engages with teeth 25 formed on the under face vof the wheel 13.

The upper track member 12 is of channel form and is rotatably secured to the lower carriage 9 by means of the stud 10 and opening 11 as before described. The bottom of the track member is provided with a longitudinally extending slot 26 and the sides of said member are provided with the longitudinally extending grooves 27. These sides, below said grooves are provided 'with the racks 28, one of which is ofl greater length than the other for a purpose to be hereinafter described.

29 indicates the upper carriage slidably mounted in the upper track member and having the ribs 29' engaging the grooves 27. The forward end of the carriage carries the cutting tool 30. This tool is of the well-known worm type, with the edges of the worm provided with the teeth 31'. .These teeth engage sockets formed in the edges of the worm and are removably held in said sockets by the set screws 31. Thus the tool will bore a hole and. will also cut transversely whenV moved sidewise. The tool is rotated by means of the beveled gear 31 thereon meshing with a like gear 32, which is keyed to a shaft 33 journaled in the upper carriage 29. The said shaft is provided with a crank 311 to which the crank shaft 35 of the motor 36 is connected. The motor is of any desired type and is mounted on the rear end of the carriage as shown.V The shaft 33 is provided with the worm 37 and a gear 38 on a longitudinally extending shaft 39 meshes with this worm. The shaft 39 is suitably journaledg in the lower part of the carriage 29 and carries a large bevel gear 40 and a small gear el. The large gear 4:0 'meshes with a bevel gear 42.011 a stub shaft 43 carried by the carriage and extending through the slot 26 in the bottom of the member 12 and the lower end of this|` shaft carries a toothed wheel 1111. A part 45 of the carriage projects through the said slot 26 and forms a bearing for the lower end of the shaft. This wheel/la mesh es with the wheel 13 carried by the stud on the lower' carriage when the carriage is in its forward position.

' The rear end of the carriageV carries a shaft 46.' The outer ends of this shaft carry toothed wheels or gears 18 and 4:9 which mesh with the racks 23 on the upper track member 12. The shaft 116 is provided with the double' sliding gears 50, operated by a suitable levero 51 so that said gears 50 may be moved into mesh with the gears 110 and 41. By this means, when the Cutting tool is moved forward to bore a hole in the shaft head one of the gears 50 is moved into mesh with the small gear 11, while the other gear 50 is moved out of mesh with the large gear 10. This will cause the gear [13 on the shaft 110 to travel over the shortrack 23 and thus slowly feed the carriage forward to cause the cut-ting tool to bore 'hole inV the shaft head. This movement will continue until the gear 48 runs off the Vend of the rack 23 stops the carriage. Then this occurs the gear 411 on the stub shaft e13 will be in mesh with the gear wheel 13 carried by the lower carriage. W hen the leve'r ieaise g 40 sothat the upper carriage will be quickly returned to its rearmost position.

When the gear 4111 on the stub shaft 413 is in mesh with the gear 13, said gear 13 will be caused to rotate and the rotation of this gear will, through the gears 21 and 22 and dogs 23 before described, ca-use the lower carriage to slowly move along thev lower track member to cause the Cutting tool to make a transverse cut in the shaft head.

Before beginning the boring operation the machine is placed with the lower track member l parallel with the shaft head and with the upper track member at right angles to the lower track 'member and with its front end facing the shaft head so that the boring tool will be in position to bore a hole in the shaft head. The engine is then started to move the upper carriage forwardly to cause the boring tool to bore a holein the shaft head and when thercarriage reaches the end of its forward movement the gear V44 will engage the gear 13 so that the lower carriage will move along the lower trackway so as to make a transverse cut in the shaft as before described. I form an opening G0 in the block '3 and a plur'ality of openings 61 in the lower track member so that the track member may be held against movement on said block 3 by placing a bar or rod through said openings 61 and 60. This will prevent the track member 41 from moving on said block 3 when the lower carriage is moved. Similar bars and tholes or set screws may be provided for preventing rotation of the part 2 in the truck and the rotation of block 3.in the part 2. l/V hen the lower carriage reaches the end of the lower track member said carriage is i held against movement in any suitable manner, such as by placing a timber against the shaft head with its end resting against said carria ge. The bar passing through the holes G0 and 61 is then removed and the engine reversed. This will cause the wheel 13 to be rotated in an opposite direct-ion so that the dogs 23 carried by the wheel 21 will slip over the teeth on the wheel 22 while the dogs 18 will engage the teeth on the wheel 1-1 so as to rotate the toothed wheel 20. This will cause the lower track member l to quickly slide on the block 3 and through the lower carriage 9, said carriage being held stationary as before described. As soon as the said track member has reached the desired position the engine is stopped and the bar again placed through the holes (50 and 61 and the carriage 9 released. The said carriage 9 is then ready to travel along the lower track member ll. T11 this way a transverse cut may be made in the shaft head substantially twice the length of the track member V4;.

nasz-3,189

When the lower carriage reaches the end of the lower track way it may be returned to its starting position on said track way by reversing the engine as before described, but permitting the bar to remain in the holes 60 and 61. After the cut is made the parts may be `rotated on the truck and the truck withdrawn from the shaft.

lt is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent.

i desire it to be nnderstood that l may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the soope of the appended claims.

lWhat I claim is 1-- 1. A coal-digger comprising a truck, a lower track member adjustably mounted thereon, a pair of racks on said member, a lower carriage slidably mounted on said track member, two sets of gearing carried by the carriage and engaging said racks, pawls for connecting the gears of each set together, a main gear on the carriage connerted with the two sets of gearings, an upper track member adjustably carried by the carriage, racks on said, upper track member, an upper carriage slidably mounted on said upper track member, gears carried by said upper carriage engaging with said racks, a motor on the carriage connected with said gears for moving the upper carriage on its track, means for automatically connecting said motor with the main gear on the lower carriage at the end of the forward movement of the upper carriage, and va Cutting tool carried bythe upper carriage and operatively connected with the motor.

2. A coal-digger comprising a truck, a lower track member adjustably mounted thereon, a pair of raoks on said member, 'a lower carriage slidably mounted on said track member, two sets of gearing carried by the carriage and engaging said racks, pawls for oonnecting the gears of each set together, a main gear on the oarriage connected with the two sets of gearings, an upper track adjustably carried by the carriage, a pair of racks on said upper track member, one of said last named racksV being longer than the other, an upper carriage slidably mounted on the upper track member, toothed Wheels carried by the upper carriage and engaging said pair of racks, slidable gears connected with said wheels, driven gears with which the sliding gears are adapted to engag'e, a motor connected with said driven gears and carried by the upper carriage, a stub shaft carried by the upper carriage, a gear on the upper end of said shaft engaging with the driven gears connected with the motor, a gear on the lower end of said shaft for engaging with the gearing on the lower carriage at the end of the forward movement of the upper carriage and a boring tool carried by the upper carriage and connected with the motor.

3. A coal digger comprising a truck, a lower track member, means for adjustably mounting said track member on the truck, a lower carriage, means for slowly moving the carriage on said track member in one direction and quickly moving it in the opposite direction, an upper trackV member carried by the lower carriage, an upper carriage carried by the upper track member, means for slowly moving the carriage forwardly on said upper track member and quickly returning said carriage to its rearmost position, a Cutting tool carried by the carriage and means coperating with the before mentioned means for automatically moving the lower carriage in its feeding direction at the completion of the forward movement of the upper carriage.

In testimony whereof I afiix my signature.

JOHN NEVVARK.V 

